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11. 发明授权

US5948083A System and method for self-adjusting data strobe 失效
标题翻译：数据选通自动调节系统及方法
公开(公告)号：US5948083A
公开(公告)日：1999-09-07
申请号：US941402
申请日：1997-09-30
申请人： William M. Gervasi
发明人： William M. Gervasi
IPC分类号： H03K5/13 , H04L7/033 , G06F13/42
CPC分类号： H04L7/0337 , H03K5/133 , H04L7/0033
摘要： A data capture system includes a data early latch, a data on-time latch, and a data late latch each coupled to receive an input data signal and a first, second, and third data strobe signal, respectively. When the respective data strobe signal is triggered the respective data latch captures, or latches, the input data signal at three intervals resulting in oversampled input data signals. The on-time data latch generates the latched data signal. The latched data signal is compared with the data early signal latched by the data early latch as well the data late signal latched by the data late latch. If the latched data signal and the data early signal are not equal, a delay controller increases the delays of the data strobe signals. If the latched data signal and the data late signal are not equal, the delay controller decreases the delays of the data strobe signals. If the latched data is equal to the data early signal no delay adjustment is made and likewise if the latched data is equal to the data late signal no delay adjustment is made. Further, the delay controller may include a counting circuit to adjust the data strobe signals at particular intervals. A method for adjusting data strobe signals for data capture is also disclosed.
摘要翻译：数据采集系统包括分别耦合以接收输入数据信号和第一，第二和第三数据选通信号的数据早期锁存器，数据准时锁存器和数据延迟锁存器。当相应的数据选通信号被触发时，相应的数据锁存器以三个间隔捕获或锁存输入数据信号，导致过采样的输入数据信号。接通时间数据锁存器产生锁存的数据信号。将锁存的数据信号与由数据提前锁存器锁存的数据早期信号以及由数据延迟锁存器锁存的数据延迟信号进行比较。如果锁存的数据信号和数据早期信号不相等，延迟控制器会增加数据选通信号的延迟。如果锁存的数据信号和数据延迟信号不相等，则延迟控制器减少数据选通信号的延迟。如果锁存的数据等于数据早期信号，则不进行延迟调整，同样如果锁存数据等于数据延迟信号，则不进行延迟调整。此外，延迟控制器可以包括用于以特定间隔调整数据选通信号的计数电路。还公开了一种用于调整用于数据捕获的数据选通信号的方法。

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